This is my favourite protein shake, as it's the only one I've found that I can drink every day and not hate it after a while. Usually retails for around £30ish for 5kg.
Not the most amazing deal and amazon is showing a 1-2 month lead time, but if you're not in a hurry. Sometimes you can get it cheaper on ebay if you bulk buy several bags, but for just one 5kg bag this is not bad. I guess the price may be hovering and it might even be as low as the £24 shown on camels.
I believe it is free delivery and/or free C&C.